Did the POSIX security model (users, file permissions) also impact your “computing freedom”? Is your CPU constantly running in kernel mode? Do you have all phys

Did the POSIX security model (users, file permissions) also impact your “computing freedom”? Is your CPU constantly running in kernel mode? Do you have all physical memory mapped into all address spaces, and as read/write/executable? Are you allowing all software to listen on outward ports without any packet filter?